Revert "Revert "Remove a compat hack SurfaceView#setWindowType()""

This reverts commit 9309c195.

Reason for revert: We can now remove the deprecated method. Compat hack
is no longer required for keyboards.
Fixes: 62054282
Test: Manually flashed and verified keyboard apps work.

Change-Id: Iae0c82b6fd3fd5930e9eea3216fab76925839e4d